<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Promise测试</title>
</head>

<body>
    <script>
        var promise = new Promise((resolve, reject) => {
            resolve(100);
        })
        var p1 = promise.then((value) => {
            console.log(value);
            return p1;
        })
        p1.then((value) => { console.log(value); }, (reason) => { console.log(reason); })
    </script>
</body>

</html>